This happend to Marty's! We used some JB Weld to glue it in, then we used our seat latch and it hasn't come out since! You won't be unscrewing it anymore so it won't have a chance to come out.
Thanks Jeff I am going to try to glue the thread back in and try that first. I know this sounds bad, but there is a big hole where the threads used to be. I am not sure if I have enough to grip anymore.